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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a03c16f024d7a4f8dec88a6509c00c75c3f162c3a4557086b1ed11c14d90d13' 
  AND token = '10gs9DRTxDCOEy4M4DTBm6N2JcgLtdJcA1K/mcMe5ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}